Extension-brace.



D. EKHOPF.

EXTENSION BRACE.

APPLIoATIoN FILED JULY ao, 1912.

1,058,226. Patented Apr.s,1913

. UNITED YSTATES PATENT OFFICE.

` DRUE EcKHorr, ormai-Iron', MISSISSIPPI.

EXTENSION-BRACE.

specification of Lettersratenz.

To ZZ 'whom t may concern.'

Be it known that I, DRUE EoKHoFF, af

I citizen of the United States,` residing at Richton, in the county ofPerry and State of Mississippi, have invented certain new and usefulImprovements in Extensionl Braces, of which the following isa specification.

My invention relates to improvements 1n extension braces, and moreparticularlyjzo a type of extension brace having a simple ing the partstd slipv or become wabbly, a

very objectionable and costly fault where highly tempered bits or twistdrills are used, the slightest b end often causing them to fracture orreceive 4aB permanent set. The object of my improvement is to eliminatethese objectionable features and to that end I have constructed the formof tool here shown. In the drawings Figure l is' an elevation of a toolfitted with my' improved extension means. Fig. 2 is a sectional view ofone of the extension members on a somewhat larger. scale than Fig. 1,showing the' construction of the adjustable elements, and Fig. 3 is asectional' view of- Fig. 2 on the line X-X. Referring to the severalparts by letters, A is a brace, being iitted with the following of myimproved features: Solid stems B provided with interrupted feathers Cand key ways D, outside sleeves E integral with the handle F and toolend F', the said sleeves being provided with key ways G and feathers H,the ,two latter features registering with interrupted feather C and keyway D in a manner to admit of a longitudiing .tral portion consisting ofa solid inner stem the nal movement only. RecessesI are cutinto4 outsidesleeves E for the purpose of allowthe, interrupted feather C, Pins Malso-se? PatentedApr.8,19`13. Application filed lJ'uly 30, 1912. SerialNo. 712,269. L

ving the locking pins K, secured in the spring cured to the lockingrings L are merely for the purpose of insuring a perfect balance whenthe springs N coact with the springI pins and O, the said lattermentioned sprlngs being omitted if desired.

`An abutment lug P is disposed on each stem B, as shown, near the innerend and at the innermost end of the. interrupted feather portion C, in amanner to form, in`

conjunction with the feather, substantially a letter L when viewed fromthe top of Fig.

'2. The said lug is disposed around' the pe.-

riphery of the stem B, the full width, of threces'sI and the upperkey'way G as viewed from Fig. 3. The above mentioned lug is:

for the purpose of preventing displacement of the parts, but by removingthe screw locking pins the tool may be taken down. I'c1aim:. In anextension brace the combination of an upper handle portion,fa lower toolcarry:

portion and a sliding adjustable cenandle portion, the said centrallhandle ends of which'are disposed at right angles to its verticalgripping portion, hollow sleeves integral with the upper handle portionand the lower tool carrying portion respectively, key ways andinterrupted feathers upon the solid stem portions, key ways and feathersin the hollow sleeve portions.

registering with the key ways and interrupted feathers of the solid stemportions, the lsaid hollow sleeves being slidably mount- .ed upon the'solid stem portions, and spring -impelled locking rings mounted upon thehollow sleeve portions, the said rings having inwardly protrudinglocking pinsadapted to engage the said interrupted feather portions.

In'testimony whereofI affix my signature in presence of two witnesses.

DRUE ECKHOFF.

lVitnesses: I

J. lV. CorELAND, O. C. SELLERS.'

